Spring Batch is a framework for batch processing in Java. It allows developers to process large volumes of records by dividing the work into small chunks called steps. The framework includes components like job launcher, job repository, step, item reader, item processor and item writer to process a batch job. Jobs are composed of steps, and steps use readers, processors and writers to read, process and write data.
Spring Batch is a framework for batch processing in Java. It allows developers to process large volumes of records by dividing the work into small chunks called steps. The framework includes components like job launcher, job repository, step, item reader, item processor and item writer to process a batch job. Jobs are composed of steps, and steps use readers, processors and writers to read, process and write data.
@ represents the HEAD commit. - indicates where you were previously checked out. -- declares the next argument is a file. : specifies a file in a revision. ~ refers to the parent commit of the current commit. This document provides Git tips and shortcuts for commands like log, diff, checkout, merge, rebase using symbols like @, -, :, ~ to reference commits, files, and revisions.
The document introduces the Guzzle HTTP client library for PHP, covering its main features and providing examples of basic usage. It discusses Guzzle's asynchronous capabilities using Guzzle Promises and how to test requests using a MockHandler. The handler is highlighted as central to Guzzle's functionality, with examples given of different handler types that can be passed to the client. Contributing to Guzzle's large codebase is encouraged.
This document discusses installing PHP7 on CentOS7 using Ansible. It provides commands to install the EPEL and Remi repositories, install PHP7 and related packages, and enable PHP7. It then shows how this process can be automated using Ansible roles and playbooks, including links to the example role and playbook on GitHub.
This document discusses dependency injection and the Pimple dependency injection container. It explains what dependency injection is, how it improves code by removing tight coupling, and how a dependency injection container like Pimple works. Pimple allows defining services that are injected where needed, avoiding repetitive instantiation of objects. It implements ArrayAccess to allow accessing services like an array. This reduces complexity and improves testability over directly instantiating dependencies, though it can make code less intuitive for IDEs.
14. 左のコードは右のコードと等価
class A
{
public function getMe(): A
{
return $this;
}
}
class B extends A {}
$b = new B();
$b->getMe(); // B
class A
{
public function getMe(): self
{
return $this;
}
}
class B extends A {}
$b = new B();
$b->getMe(); // B
24. 余談:メソッドの引数でも使える
class A
{
public function setMe(self $self)
{
$this->self = $self;
}
}
class B extends A
{
public function setMe(parent $self)
{
$this->self = $self;
}
}